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Sensors 2016, 16(8), 1177; doi:10.3390/s16081177

Near-Space TOPSAR Large-Scene Full-Aperture Imaging Scheme Based on Two-Step Processing

School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Scott Palo
Received: 13 April 2016 / Revised: 22 June 2016 / Accepted: 20 July 2016 / Published: 27 July 2016
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Abstract

Free of the constraints of orbit mechanisms, weather conditions and minimum antenna area, synthetic aperture radar (SAR) equipped on near-space platform is more suitable for sustained large-scene imaging compared with the spaceborne and airborne counterparts. Terrain observation by progressive scans (TOPS), which is a novel wide-swath imaging mode and allows the beam of SAR to scan along the azimuth, can reduce the time of echo acquisition for large scene. Thus, near-space TOPS-mode SAR (NS-TOPSAR) provides a new opportunity for sustained large-scene imaging. An efficient full-aperture imaging scheme for NS-TOPSAR is proposed in this paper. In this scheme, firstly, two-step processing (TSP) is adopted to eliminate the Doppler aliasing of the echo. Then, the data is focused in two-dimensional frequency domain (FD) based on Stolt interpolation. Finally, a modified TSP (MTSP) is performed to remove the azimuth aliasing. Simulations are presented to demonstrate the validity of the proposed imaging scheme for near-space large-scene imaging application. View Full-Text
Keywords: SAR; near-space SAR; TOPS; sustained large-scene imaging; two-step processing; modified two-step processing SAR; near-space SAR; TOPS; sustained large-scene imaging; two-step processing; modified two-step processing
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MDPI and ACS Style

Zhang, Q.; Wu, J.; Li, W.; Huang, Y.; Yang, J.; Yang, H. Near-Space TOPSAR Large-Scene Full-Aperture Imaging Scheme Based on Two-Step Processing. Sensors 2016, 16, 1177.

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